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BTS, BSC, MSC details

Presentation · February 2016

DOI: 10.13140/RG.2.1.2075.6241

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Higher Institute for Applied Science and Technology Telecommunication department Fifth year 2015-2016

BTS, BSC, MSC details

Raghda Khadoor

Supervisor: Dr. Nizar Zarka

Raghda Khadoor & Dr. Nizar Zarka

Feb 2016

OUTLINE

GSM architecture

BTS

BSC

MSC

Raghda Khadoor & Dr. Nizar Zarka

GSM architecture

the GSM network architecture consists of different elements that all

interact together to form the overall GSM system. These include

elements like the base-station, BSC, MSC, AuC, HLR, VLR, etc.

Raghda Khadoor & Dr. Nizar Zarka

Base Transceiver Station (BTS):

The BTS used in a GSM network comprises the radio

transmitter receivers.

The BTS is the defining element for each cell.

The BTS communicates with the mobiles and the

interface between the two is known as the Um interface

with its associated protocols.

Raghda Khadoor & Dr. Nizar Zarka

BTS architecture

Raghda Khadoor & Dr. Nizar Zarka

Linking units transmitter and receiver with different

location cells

Raghda Khadoor & Dr. Nizar Zarka

Base Station Controller (BSC):

The BSC forms the next stage back into the GSM

network.

It controls a group of BTSs, and is often co-located

with one of the BTSs in its group.

It manages the radio resources and controls items

such as handover within the group of BTSs,

allocates channels and the like.

It communicates with the BTSs over what is termed

the Abis interface.

Raghda Khadoor & Dr. Nizar Zarka

BSC architecture

Raghda Khadoor & Dr. Nizar Zarka

Mobile Switching services Centre (MSC)

The main element within the core network area of the

overall GSM network architecture is the Mobile

switching Services Centre (MSC).It provides registration,

authentication, call location, inter-MSC handovers and

call routing to a mobile subscriber.

It also provides an interface to the PSTN so that calls

can be routed from the mobile network to a phone

connected to a landline.

Interfaces to other MSCs are provided to enable calls to

be made to mobiles on different networks.

Raghda Khadoor & Dr. Nizar Zarka

MSC architecture

Raghda Khadoor & Dr. Nizar Zarka

VLR : This contains selected information from the HLR that

enables the selected services for the individual

subscriber to be provided. The VLR can be

implemented as a separate entity, but it is commonly

realised as an integral part of the MSC, rather than a

separate entity. In this way access is made faster and

more convenient.

This database contains all the administrative information about each

subscriber along with their last known location.

HLR

Raghda Khadoor & Dr. Nizar Zarka

Authentication Centre (AuC)

The AuC is a protected database that contains the secret key also

contained in the user's SIM card. It is used for authentication and for ciphering on the radio channel.

Equipment Identity Register (EIR)

The EIR is the entity that decides whether a given mobile equipment may be allowed onto the network. Each mobile equipment has a

number known as the International Mobile Equipment Identity

Raghda Khadoor & Dr. Nizar Zarka

Thank you

Raghda Khadoor & Dr. Nizar Zarka

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